Safety device for mine-elevator cages.



G. COATES.

SAFETY DEVICE FOR MINE ELEVATOR CAGES.

11 e 0 2m 3 a LL. 0 m E n m P N m \N 9 1V 9 M 1 N 2, w -m RNEIWIMN- W ILII e. COATES.

SAFETY DEVICE FOR MINE ELEVATOR CAGES.

APPLICATION FILED SEPT. I. 1916.

Patented Mar.- 20, 1917.

2 SHEETS-SHEET 2.

UNITED STATES PATENT OFFICE.

GEORGE oon rns; 0F VICTOR, COLORADO, ASSIGNOR or oNE-EreH'rHao RIoHARn W.

COAIES AND ONE-EIGHTH T0 JOHN s. WALKER, BOTH or vrc'ro ooLoR no.

SAFE Y, DEVICE FOR MINE-ELEVATO CAGES.

Specification of Letters Patent.

Patented Mar. 20, 11917.

Application filed September 1,1916. Serial No. 118,963.

To all whom it may concern.

Be it known that I, GEORGE CoA'rns, subject ofthe King of GreatBritain, residing at Victor, in the county of Teller and State of Colorado, haveinvented certain new {UK useful Improvements inSafety Devices for MineElevator Cages; and I do hereby declare-the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

The object of this invention'is the provision of simple, durable and efficient safety mechanism for the carriage of a mine elevator, which will positively operate to prevent gravitation of the carriage should the hoisting cable break.

Other objects will appear and'be better understood from that embodiment of my invention of which the following is a specification, reference being had to the accompanying drawing forming a part thereof, in which:

Figure 1 is a side view of the elevator carriage, showing a portion of the safety mechanism in operative position,

Fig. 2 is a front elevation of the carriage, showing the safety mechanism associated therewith,

Fig. 3 is a transverse section, taken on the linev 33 of Fig. 2,

Fig. 4 is a vertical detail elevation of one of the sides of the carriage, showing the inner surface of the side thereof,

Fig. 5 is a section taken on the line 5-5 of Flg. 2, and

Fig. 6 is a detail view of a portion of the safety mechanism. 7

Referring to the drawings in detail, the numeral 1 designates a pair of opposed guides, which are formed, preferably, of wood, and the numeral 2 designates the elevator car or carriage having extending upwardly from the sides thereof a pair of channeled uprights 3, which receive the guides, the said uprights being braced by upwardly converging bars 41. A pair of bars 5 extend transversely of the uprights 3, adjacent the upper ends thereof, and a rod 6 extends at right angles to the bars 5, and has its opposite ends connected to the bars 5, the rod 6 serving to brace the upper ends of the uprights 3 against inward strain.

Mounted on the outer sides of the guides 1 is a pair of elongated plates 7 formed ofmet'al. These plates 7 have their longitudi-' nal edges projecting beyond the sides of the guides 1 and'cut away to provide teeth'8- {A pair of horizontally disposed sl1afts9 have their opposite ends journaled in the bars 5, at points on opposite sides of the uprights 3, and have their terminals extending beyond the arms 5 and lying on opposite sides ofthe guides 1, in spaced relation thereto. Pawls, or dogs 10, are carriedby the terminals of the shafts 9 and each has the smaller end thereof slightly curved, as

shown at 11, and sharpened, and the'outer side of each pawl is cut away, at the sharpened end of the pawl, to provide. a shoulder 12, the lower face of which is inclined upwardly and rearwardly to provide a pointed end 13. The pointed ends 13 of the shoul ders 12 on the pawls 10 are located opposite the teeth 8, and the pointed ends of the pawls 1O are'disposed opposite the guides 1.

Disposed above the rod 6 is another rod 1 1.

This rod 14 has its opposite ends mounted in 7 guides 15 on the inner surface of the upright 3, adjacent the upper ends of the uprights,

and the said rod 14: is adapted to have connection with the lower end of the lifting or holstlng cable for the elevator carriage or car 2, secured thereto. A pair of intersect-v ing llnks 16 and 17 is carried by each end of,

the rod 14 and have their lower ends pivot} ally connected to arms 18, which extend upwardly from the shafts 9. When the carriage 2 is suspended from the lifting cable, not shown, the rod 14 will be pulled upwardly in the guides 15 and through the medium of the links 16 and 17 and the arms 18, the shafts 9 will be rotated in the'direction to move the pawl 10 and the shoulders 12 to points spaced from the respective guides l and the teeth 8 on the plate '7. Springs 19 have connection with the shafts 9, and the rod 14;, and when the rod 1 1 is V moved upwardly the springs 19 will be expanded. Should the lifting cable break,

the shafts 9 will rotate in the opposite direction, the contraction of the springs 19 effecting the rotation of the shafts, and the pointed ends 13 of the shoulders 12 will contact with adjacent teeth 8 and effect a further rotation of the shafts 9 so as to bring the pointed ends of the pawls 10 into engagement with the guides 1, and cause the pointed ends of the pawls to engage in the guides and prevent gravitation of the carriage 2. When the pawls engage in the guides 1, the upper surfaces of the shoulders 12 will lie in close proximity to the lower faces of the uppermost adjacent teeth 8, and if the pointed ends of the pawls should be disengaged from the guides, the upper surfaces of the shoulders will contact with the adjacent upper teeth and hold the pawls in position where they can again engage the guides and prevent gravitation of the elevator carriage. This engagement between the upper surfaces of the shoulders 12 and the adjacent upper teeth 8 will also limit the degree of penetration of the pointed ends of the pawls in the guides, so as to prevent the engagement between the pawls 10 and the guides 1 from disfiguring or mutilating the guides.

It is evident that various changes might be resorted to in the construction, form and arrangement of the several parts without departing from the spirit and scope of my invention; hence I do not Wish to limit myself "strictly to the structure herein described and claimed.

Having thus described my invention what I claim as new is:

In safety brake mechanism for an elevator, the combination with the elevator car and the car guides, of a pair of guides mounted on the car, a vertically movable rod mounted in the guides on the car and adapted to have connection with the hoisting cable and to descend upon breaking of the cable, a pair of shafts journaled on the car, links connected to the movable rod, arms carried by the shafts and having connection With the links so astoeffect rotation of the shafts in one directionvwhen the rod descends, springs connecting the shafts to the rod and adapted to normally exert a downward pull on the rod, and means carried by the shafts and adapted to engage the a Copies of this patent may be obtained for five cents each, by addressing the Commissioner of 2mm. Washington, D. G. 

